August 2017 - kernelnewbies@kernelnewbies.org

Guide to Stacking device mappers w examples
by Jonas Aug. 2, 2017

Aug. 2, 2017

Hi I want to write data to dm-dedup device, store that on a zram w lz4 compressed. Then dm-mirror the zram to dm-writeboost that have a Ssd as block device/final destination. Is there any guide w examples on how to stack device mappers? Or anyone having instructions or guidlines on how to do? /J

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Re: new sysctl tunable knob for tcpip
by Massimo Sala Aug. 1, 2017

Aug. 1, 2017

I wish to suggest to developers to add this new knob : tcp_retries2_time - INTEGER This value influences the timeout (seconds) of an alive TCP connection, when RTO retransmissions remain unacknowledged. RFC 1122 recommends at least 100 seconds for the timeout, which corresponds to a value of at least 8. Rationale : * I see too many abuse of tcp_retries2, because even if you check the RTO, it will change with different connections, routing, etc. * It will be friendly and I think better to document an absolute value. See other parameters with two knobs ( example : dirty_ratio, dirty_ratio_bytes ). >> q1) which is the right kernel m-list to discuss it ? > net...@vger.kernel.org > Good luck! > greg k-h mlist : netdev(a)vger.kernel.org ? Best regards, Sala

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Re: Compiling customer kernel for Debian 9.X
by Valentin Vidic Aug. 1, 2017

Aug. 1, 2017

On Wed, Jul 26, 2017 at 09:14:41AM -0700, HP Garcia wrote: > What's to the procedure for compiling a custom kernel for Debian 9.X. make-kpkg should do the trick if you need to create a kernel package: https://wiki.debian.org/BuildADebianKernelPackage -- Valentin

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version number of Linux kernel development
by Yubin Ruan Aug. 1, 2017

Aug. 1, 2017

Hi, I got a question regarding to Linux's version number. According to some talk from Greg KH, there would be an accompanying stable release along with every -rc release, that is, something like this: 4.2.0 | \ 4.3.1-rc 4.2.1 | | 4.3.2-rc 4.2.2 | | 4.3.3-rc 4.2.3 | | 4.3.4-rc 4.2.4 | | 4.3.5-rc 4.2.5 | | 4.3.6-rc 4.2.6 | | 4.3.7-rc 4.2.7 <- this branch is thrown away after 4.4.0 is released | 4.4.0 So, in this example, 4.2.7 would be thrown away after 4.4.0 is released. Is this the same for every major release? I see a series of 4.4.x release, ranging from 4.4.1 ~ 4.4.49, at http://elixir.free-electrons.com/linux/latest/source which really confused me. Accoding to the model above, there should be only 4.4.7. After that, it would 4.5.x. Please correct me if I am wrong. Thanks, Yubin

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